#include	"apue.h"
#include	<fcntl.h>

int
main(int argc, char *argv[])
{
	int	val;

	if (argc != 2)
		err_quit("usage: a.out <descriptor#>");

	if ((val = fcntl(atoi(argv[1]), F_GETFL, 0)) < 0)
		err_sys("fcntl error for fd %d", atoi(argv[1]));

	switch (val & O_ACCMODE)
	{
		case	O_RDONLY:
			printf("read only");
			break;

		case	O_WRONLY:
			printf("write only");
			break;

		case	O_RDWR:
			printf("read write");
			break;

		default:
			err_dump("unknown access mode");
	}

	if (val & O_APPEND)
		printf(", append");
	if (val & O_NONBLOCK)
		printf(", nonblocking");
#if defined(O_SYNC)
	if (val & O_SYNC)
		printf(", synchronous writes");
#endif

#if !defined(_POSIX_C_SOURCE) && defined(O_FSYNC)
	if (val & O_FSYNC)
		printf(", synchronous writes");
#endif
	putchar('\n');
	exit(0);
}
